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Quick Ben had been a former prime contender for the Magi of Shadow position in the Deck of Dragons. [citation needed]
After defecting from the cult of Rashan and burning the robes of his vestment[20], he became a mage primarily utilizing the Meanas warren. He then became one of twelve members of the Holy Falah'd's Mage cabal.
According to the Korvalah demon Pearl, the name Ben Adaephon Delat was marked on the scrolls listing the Mages who fell to the Empire in Seven Cities[21].
Bolded the part that made me think.
Now, I am not 100% sure on QB's timeline, but I've always had the impression that he could not have been a priest of Shadow exclusively before becoming a mage serving the Holy Falah'd. Is there a citation regarding that? For one, Whiskeyjack calls him the youngest of the mages in the employ of the Holy Falah'd. And also, the Cult of Rashan was destroyed after the Malazan Empire had conquered Seven Cities, at which point QB was still recognized as a High Priest. The destruction of the cult seems to have happened shortly after ST and Cotillion's ascension. Maybe it was all close in time, but still seems not like for QB to have been a priest, then to have become a mage in the employ of the Holy Falah'd, then to have openly returned to the cult just to destroy it, especially if he had been working with ST and Cotillion at the time of the cult's destruction. Also, this was likely closer to the time at which he'd be a likely candidate for the Magi of Shadow position.
It's all jumbled and maybe it's been talked over on the wiki already. I just wanted to make sure. Will provide what quotes I can later when I'm home, if needed.
All I can give right now is the following from HoC, emphasis added by me:
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..meaning that happened after his time as a mage for the Holy Falah'd. Also, I may be wrong on ST having had ascended already at that time, but anyway, my point is that the timeline on the Wiki seems the wrong way around.